Articolo in rivista, 2023, ENG

Half-integer Shapiro steps in highly transmissive InSb nanoflag Josephson junctions

A. Iorio, A. Crippa, B. Turini, S. Salimian, M. Carrega, L. Chirolli, V. Zannier, L. Sorba, E. Strambini, F. Giazotto, and S. Heun

NEST, Istituto Nanoscienze-CNR, Scuola Normale Superiore, Piazza San Silvestro 12, Pisa, 56127, Italy CNR-SPIN, Via Dodecaneso 33, Genoa, 16146, Italy

We investigate a ballistic InSb nanoflag-based Josephson junction with Nb superconducting contacts. The high transparency of the superconductor-semiconductor interfaces enables the exploration of quantum transport with parallel short and long conducting channels. Under microwave irradiation, we observe half-integer Shapiro steps that are robust to temperature, suggesting their possible nonequilibrium origin. Our results demonstrate the potential of ballistic InSb nanoflags Josephson junctions as a valuable platform for understanding the physics of hybrid devices and investigating their nonequilibrium dynamics. © 2023 authors. Published by the American Physical Society.

Physical review research 5 (3)

Keywords

Antimony compounds; Ballistics; III-V semiconductors; Indium antimonides; Josephson junction devices; Microwave irradiation; Semiconductor junctions

CNR authors

Chirolli Luca, Strambini Elia, Salimian Sedighe, D Iorio Andrea, Carrega Matteo, Zannier Valentina, Crippa Alessandro, Sorba Lucia, Giazotto Francesco, Heun Stefan

CNR institutes

NANO – Istituto Nanoscienze